Magnetic Tuning of the Relativistic BCS-BEC Crossover
Abstract
The effect of an applied magnetic field in the crossover from Bose-Einstein condensate (BEC) to Bardeen-Cooper-Schrieffer (BCS) pairing regimes is investigated. We use a model of relativistic fermions and bosons inspired by those previously used in the context of cold fermionic atoms and in the magnetic-color-flavor-locking phase of color superconductivity. It turns out that as with cold atom systems, an applied magnetic field can also tune the BCS-BEC crossover in the relativistic case. We find that no matter what the initial state is at B=0, for large enough magnetic fields the system always settles into a pure BCS regime. In contrast to the atomic case, the magnetic field tuning of the crossover in the relativistic system is not connected to a Feshbach resonance, but to the relative numbers of Landau levels with either BEC or BCS type of dispersion relations that are occupied at each magnetic field strength.
Keywords
Cite
@article{arxiv.1012.3204,
title = {Magnetic Tuning of the Relativistic BCS-BEC Crossover},
author = {Jin-cheng Wang and Vivian de la Incera and Efrain J. Ferrer and Qun Wang},
journal= {arXiv preprint arXiv:1012.3204},
year = {2013}
}
Comments
Extensively revised version. New version with new plots and new references to appear at PRD